New to me: 1978 GMC High Sierra c25

[slotard]

Do you know what trans? My best guess is 700R4, which I don't think was around until 82, so someone swapped it in. It's a little on the light duty side for a 3/4 ton. Did it drive fine when you bought it? Have you checked transmission fluid level? Is it possible you have a drum that's a little seized or something (see if you can roll it easily by hand)?

I have those same years on mine ('73 C20 CS), they flip in to make it not quite so outrageously wide.

Does it still have the build tag with all the RPO codes? If so, you can confirm Camper Special based on that. Or, the badge behind the door might be tent shaped, which means CS. Your rear end appears to be a 14FF, if you post a picture of your spring pack I can look at it vs mine to confirm CS.

[ezslim]

Originally Posted by slotard

Do you know what trans? My best guess is 700R4, which I don't think was around until 82, so someone swapped it in. It's a little on the light duty side for a 3/4 ton. Did it drive fine when you bought it? Have you checked transmission fluid level? Is it possible you have a drum that's a little seized or something (see if you can roll it easily by hand)?

I have those same years on mine ('73 C20 CS), they flip in to make it not quite so outrageously wide.

Does it still have the build tag with all the RPO codes? If so, you can confirm Camper Special based on that. Or, the badge behind the door might be tent shaped, which means CS. Your rear end appears to be a 14FF, if you post a picture of your spring pack I can look at it vs mine to confirm CS.

Thanks for the reply. Ill check out what trans it is sometime this week. By the time I get home its usually dark. The battery died on me today so I couldn't crank it but I did put it in neutral and it rolled back so it might not be seized brakes.

When I bought it, I drove it very little as it was buried in snow and as soon as i moved forward it got stuck. We ended up pulling it out using the sellers truck and he drove it up the street. I had CAA (canadian AAA) tow it to my place. they towed it by lifting the rear as its 2wd. So i dont think they could have damaged it... I hope the tranny isnt gone otherwise it'll eat into my budget for other mods.